/*
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * The Original Code is iSQL-Viewer, A Mutli-Platform Database Tool.
 *
 * The Initial Developer of the Original Code is iSQL-Viewer, A Mutli-Platform Database Tool.
 * Portions created by Mark A. Kobold are Copyright (C) 2000-2007. All Rights Reserved.
 *
 * Contributor(s): 
 *  Mark A. Kobold [mkobold <at> isqlviewer <dot> com].
 *  
 * If you didn't download this code from the following link, you should check
 * if you aren't using an obsolete version: http://www.isqlviewer.com
 */
package org.isqlviewer.ui.dnd;

import java.awt.Component;
import java.awt.HeadlessException;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;

import javax.swing.JTabbedPane;
import javax.swing.plaf.TabbedPaneUI;

import org.isqlviewer.swing.EnhancedTabbedPane;

/**
 * Enhanced Drop target for TabbedPanes.
 * <p>
 * Currently this drop target creates that dragOver tab / change selection effect. Not quite a spring loaded effect but
 * effective for dragging something from one view to abother tabbed view
 * 
 * @author Mark A. Kobold &lt;mkobold at isqlviewer dot com&gt;
 * @version 1.0
 */
public class TabbedPaneDropTarget extends DropTarget {

    private static final long serialVersionUID = 7669524130710371514L;
    private final EnhancedTabbedPane pane;
    private int currentDraggingIndex = -1;

    public TabbedPaneDropTarget(EnhancedTabbedPane pane, Component c, DropTargetListener dtl) throws HeadlessException {

        super(c, dtl);
        this.pane = pane;
    }

    @Override
    public synchronized void dragEnter(DropTargetDragEvent dtde) {

        TabbedPaneUI tabUI = this.pane.getUI();
        JTabbedPane source = (JTabbedPane) getComponent();
        int x = dtde.getLocation().x;
        int y = dtde.getLocation().y;
        int index = tabUI.tabForCoordinate(source, x, y);
        if (index >= 0) {
            source.setSelectedIndex(index);
            currentDraggingIndex = index;
        }
    }

    @Override
    public synchronized void dragExit(DropTargetEvent dte) {

        currentDraggingIndex = -1;
    }

    @Override
    public synchronized void dragOver(DropTargetDragEvent dtde) {

        TabbedPaneUI tabUI = this.pane.getUI();
        JTabbedPane source = (JTabbedPane) getComponent();
        int x = dtde.getLocation().x;
        int y = dtde.getLocation().y;
        int index = tabUI.tabForCoordinate(source, x, y);
        if (index >= 0 && currentDraggingIndex != index) {
            source.setSelectedIndex(index);
            currentDraggingIndex = index;
        }
    }
}